| RUN: %clang_cc1 -E %s -pedantic -std=c++2a | FileCheck -strict-whitespace %s | |
| #define LPAREN() ( | |
| #define G(Q) 42 | |
| #define F1(R, X, ...) __VA_OPT__(G R X) ) | |
| 1: int x = F1(LPAREN(), 0, <:-); | |
| // CHECK: 1: int x = 42; | |
| #define F2(...) f(0 __VA_OPT__(,) __VA_ARGS__) | |
| #define EMP | |
| 2: F2(EMP) | |
| // CHECK: 2: f(0 ) | |
| #define H3(X, ...) #__VA_OPT__(X##X X##X) | |
| 3: H3(, 0) | |
| // CHECK: 3: "" | |
| #define H4(X, ...) __VA_OPT__(a X ## X) ## b | |
| 4: H4(, 1) | |
| // CHECK: 4: a b | |
| #define H4B(X, ...) a ## __VA_OPT__(X ## X b) | |
| 4B: H4B(, 1) | |
| // CHECK: 4B: a b | |
| #define H5A(...) __VA_OPT__()/**/__VA_OPT__() | |
| #define H5B(X) a ## X ## b | |
| #define H5C(X) H5B(X) | |
| 5: H5C(H5A()) | |
| // CHECK: 5: ab |